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PICList Thread
'[PICLIST] [OT] MP3'
2000\06\23@135318 by rleggitt

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MP3 is composed of frames, each starts with 12 sequential ones (FFF)
followed by a header which tells, among other things, how long the frame
is, followed by huffman encoded data. It's legal to have any amount of
inter-frame information as long as FFF isn't found.

Unless the decoder is totally brain-damaged it will extract the frames
itself and you can just pass the MP3 to it verbatim.

On Wed, 21 Jun 2000, H.P. de Vries wrote:

{Quote hidden}

2000\06\23@141400 by Dr. Chris Kirtley

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I thought MP3 (and also MPEG videos) compression was somewhat different
to others (e.g. WAV, AVI, QuickTime). I notice that it doesn't seem
possible to edit either MP3 or MPEG formats, for example. I'd assumed
that this had something to do with the CODEC needing the whole file data
to be able to decode it.

I await to be corrected...

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: .....kirtleyKILLspamspam.....cua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
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2000\06\23@162434 by H.P. de Vries

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Well, it can't possibly need the whole file to be able to decode it, as
there are also streaming mp3-apps. :-)

Hans

On Fri, Jun 23, 2000 at 02:10:41PM -0400, Dr. Chris Kirtley wrote:
{Quote hidden}

2000\06\23@163253 by Dr. Chris Kirtley

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But has anyone ever seen such a thing as an MP3 editor or MPEG to AVI
converter?

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: KILLspamkirtleyKILLspamspamcua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
Send subscribe/unsubscribe to RemoveMElistprocTakeThisOuTspaminfo.curtin.edu.au

2000\06\23@163648 by Saeed Saeed
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Actually, I am also looking for one.. I need to be able to convert movies
generated by matlab to AVI or RAM, any thing that can be streamed..or is
it possible to stream mpeg like the mp3?


On Fri, 23 Jun 2000, Dr. Chris Kirtley wrote:

{Quote hidden}

2000\06\23@164518 by Dr. Chris Kirtley

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Dear Saeed,

Yes - that was my point. I've tried looking for such converters several
times. I found some links that seemed to be just what I was looking for,
but all of the turned out to be dead. I think there's actually no way to
convert MPEG to AVI. I think it's an entirely different form of
compression.

I'd love someone to tell me I'm wrong - but please don't unless you can
point us to the software that does it!

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: RemoveMEkirtleyspamTakeThisOuTcua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
Send subscribe/unsubscribe to listprocEraseMEspam.....info.curtin.edu.au

2000\06\23@170041 by H.P. de Vries

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That's true. I hadn't noticed it, but there really are no converters (that I
know of) for these formats. Weird actually. I mean, if you can decode it,
it means you must be able to re-code it somehow. At least by saving the
frames and re-assembling them to another movie-format you'd say.
But I still think you don't need the entire file to decode it. Actually, I
know that for a fact. Try cutting a random part from the end, and it still
can be decoded. All the decoder needs is the header-info (I think) from the
beginning of the file. It then keeps decoding until it sees no more valid
frames.

I'll keep looking for such software though!

Hans


On Fri, Jun 23, 2000 at 04:43:28PM -0400, Dr. Chris Kirtley wrote:
{Quote hidden}

2000\06\23@173156 by Marius Bratrein

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THe trick is to recognize the frame headers (12 1's in a row) usually FF
F3 or something, and cut/paste with a hex editor. Based on the bitrate you
know how far into the soundbite you are.

Good luck

Marius



On Fri, 23 Jun 2000, H.P. de Vries wrote:

{Quote hidden}

2000\06\23@192623 by Jinx

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First - thanks for e-m display info, very helpful. Particularly like
Staver's physical address

----- Original Message -----
From: Saeed Saeed

> Actually, I am also looking for one.. I need to be able to convert movies
> generated by matlab to AVI or RAM, any thing that can be streamed..or is
> it possible to stream mpeg like the mp3?

and

> But has anyone ever seen such a thing as an MP3 editor or MPEG to AVI
> converter?

> Chris
> --
> Dr. Chris Kirtley MD PhD

Slightly off the question, I use Real Producer Basic (free from
http://www.real.com) (Thank you Dan Creagan, still using it ! invaluable) to
convert captured AVI or MPEG to small .rm files for e-mail. A significant
reduction in size is possible (50:1) depending on the degradation you
can accept. Also, having a troll around various codec warehouses I notice
all kinds of splitters, joiners and editors for the different formats. Many
have non-expiring evaluation versions that allow you to do most functions.
I haven't a specific site address but they aren't hard to find if you search
for a particular codec like MP43 or DIVx in a search engine

2000\06\24@073029 by Arthur Brown

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Look's like tony's front end for mp3 take a look here
http://www.mp3toexe.com/

Regard's to all Art

{Original Message removed}

2000\06\24@103102 by Arthur Brown

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Re post to list after mix up on subject line
But I seen this and....

Look's like tony's front end for mp3 take a look here
http://www.mp3toexe.com/

Regard's to all Art
EraseMEartbspamcableinet.co.uk

> {Original Message removed}

2000\06\26@091420 by Andre

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PIClisters...

I´ve been looking for a MP-3 to wave converter.
Does anyone know where can I find it ?

Thanks
Andre
RemoveMEacollingEraseMEspamEraseMEzaz.com.br

{Quote hidden}

>>> {Original Message removed}

2000\06\26@092841 by Mike Knoll

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VirtualDub can convert MPEGs to AVIs.

http://www.geocities.com/virtualdub/

Mike

On Fri, 23 Jun 2000, Dr. Chris Kirtley wrote:

{Quote hidden}

2000\06\26@104433 by Dr. Chris Kirtley

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Dear Mike,

Just tested VirtualDub and it does, indeed, seem excellent! Thanks very
much for telling us about it. It's like finding El Doradao!

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: KILLspamkirtleyspamBeGonespamcua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
Send subscribe/unsubscribe to EraseMElistprocspamEraseMEinfo.curtin.edu.au

2000\06\27@130600 by Andy Howard

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> From: "Dr. Chris Kirtley" <@spam@kirtley@spam@spamspam_OUTCUA.EDU>

> But has anyone ever seen such a thing as an MP3 editor or MPEG to AVI
> converter?


Not as such but I have used the related Musicam Layer2 used in some pro
audio devices with editing software produced for for it. I seem to recall
someone from the manufacturer saying that the editor needs to uncompress x
frames of data on the fly before and after the edit point. Don't remember
why but it made sense at the time.

In this application the encode/decode was done in DSP on proprietary ISA
cards made by Digigram in France.

Currently I convert to a linear format to edit and then convert back. It's
OK for website sound effects etc. but you do lose quality.
















.

2000\06\27@153311 by John Perkinton

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Soundforge does mp3 editing.

-----Original Message-----
From: Andy Howard [spamBeGonemusicaspamKILLspamUKONLINE.CO.UK]
Sent: 27 June 2000 16:19
To: .....PICLISTspam_OUTspamMITVMA.MIT.EDU
Subject: Re: [OT] MP3


> From: "Dr. Chris Kirtley" <TakeThisOuTkirtley.....spamTakeThisOuTCUA.EDU>

> But has anyone ever seen such a thing as an MP3 editor or MPEG to AVI
> converter?


Not as such but I have used the related Musicam Layer2 used in some pro
audio devices with editing software produced for for it. I seem to recall
someone from the manufacturer saying that the editor needs to uncompress x
frames of data on the fly before and after the edit point. Don't remember
why but it made sense at the time.

In this application the encode/decode was done in DSP on proprietary ISA
cards made by Digigram in France.

Currently I convert to a linear format to edit and then convert back. It's
OK for website sound effects etc. but you do lose quality.
















.


'[PICLIST] [OT] mp3 player'
2000\11\13@172853 by Miroslav Tzvetkov
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>I am looking for a MP3 decode algorithm to play *.mp3 using PIC 16f84
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